I would highly recommend the SwaddleMe Mommie's Melodies Lamb Soother. It is soooo soft and plays different sounds (mother's heartbeat, soft lullaby, etc.). Has a button that if the baby wakes up crying, it will play whatever you have programmed. Works like a charm for baby and for Mom and Dad getting sleep!
So sweet perfect for newborn babies. I buy these as gifts as I had one with my son and if he was colicky it would calm him down to hear the heart beat when that no longer worked we turned on the music and that always worked.